int params_external (CT, int);
int open7Bit (CT, char **);
void close_encoding (CT);
-char *ct_type_str (int);
-char *ct_subtype_str (int, int);
+char *ct_type_str (int) CONST;
+char *ct_subtype_str (int, int) CONST;
int ct_str_type (const char *);
int ct_str_subtype (int, const char *);
const struct str2init *get_ct_init (int);
-const char *ce_str (int);
+const char *ce_str (int) CONST;
const struct str2init *get_ce_method (const char *);
char *content_charset (CT);
void reverse_alternative_parts (CT);